EP1612033B1 - Segment cover plate for tire building drum - Google Patents
Segment cover plate for tire building drum Download PDFInfo
- Publication number
- EP1612033B1 EP1612033B1 EP05105548A EP05105548A EP1612033B1 EP 1612033 B1 EP1612033 B1 EP 1612033B1 EP 05105548 A EP05105548 A EP 05105548A EP 05105548 A EP05105548 A EP 05105548A EP 1612033 B1 EP1612033 B1 EP 1612033B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- cover plate
- tire building
- building drum
- sidewalls
- segments
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
- B29D30/00—Producing pneumatic or solid tyres or parts thereof
- B29D30/06—Pneumatic tyres or parts thereof (e.g. produced by casting, moulding, compression moulding, injection moulding, centrifugal casting)
- B29D30/08—Building tyres
- B29D30/20—Building tyres by the flat-tyre method, i.e. building on cylindrical drums
- B29D30/24—Drums
- B29D30/244—Drums for manufacturing substantially cylindrical tyre components with cores or beads, e.g. carcasses
- B29D30/246—Drums for the multiple stage building process, i.e. the building-up of the cylindrical carcass is realised on one drum and the toroidal expansion is realised after transferring on another drum
Definitions
- the present invention relates to a tire building drum, to a cover plate for use with a tire building drum and to the use of the tire building drum.
- All terrain vehicle tires, aircraft tires and other tires have relatively longer sidewalls as compared to passenger tires.
- the longer sidewalls result in a longer chord length (i.e., the bead to bead distance) as compared to passenger tires.
- a longer chord length results in longer cover plates, which are mounted on the outer surface of a first stage tire building drum. Because the cover plates are longer, flexing or bending about their longitudinal axis may occur during the stitching operation.
- the stitching operation presses a gear-like device to the tire component layers successively mounted on the tire building drum.
- the function of the stitching operation is to eliminate trapped air from between the tire component layers of the green tire, and to promote adhesion of the layers. If excessive flexing of the cover plates occur, the stitching operation may not be effective in removing the trapped air between the layers. This may ultimately result in a defective tire.
- JP-A- 60-196330 describes a tire building drum comprising a plurality of segments and a cover plate mounted on that segments wherein the cover plate has at least one rib aligned with the longitudinal axis of the cover plate.
- Other constructions of radially expansible tire building drums using a plurality of segments in a cylindrical array are described in US-A- 3,932,256 , JP-A- 08-258 180 and JP-A- 11-309790 .
- the invention relates to a tire building drum according to claim 1.
- the invention provides a cover plate according to claim 6.
- the invention relates to the use of the building drum or of the cover plate.
- the tire building drum 10 comprises a generally cylindrical shape and is rotatable about a longitudinal axis 14.
- the tire drum 10 has a center portion 11 for receiving successive layers of tire building components such as an inner liner, side walls, chafers, breakers, ply, and beads.
- the center portion 11 is also adapted to expand radially outward, in order to tighten up the tire building components over the wire beads and to turn up the ends over the beads.
- the center portion comprises a plurality of segments or fingers 12, which are radially actuatable.
- the segments 12 are arranged in a first and second cylindrical array about a drum axis 14 on each end 11 a, 11b of the drum.
- a plurality of cover plates 30 are positioned over the segments 12.
- Each segment 12 has an upper mounting surface 20 for receiving a cover plate 30.
- Each segment 12 is radially actuatable via an air actuated piston (not shown) for moving the cover plates 30 radially outward.
- Cover plates 30 are mounted upon an upper mounting surface of a guide piston 32.
- the guide piston 32 functions to secure the coverplates to the drum and to allow the cover plates to move radially outward with the segments 12.
- Figure 2A illustrates a cross sectional view of the tire building drum 10 in the radially expanded position wherein all of the segments are in the expanded position.
- Figure 2 illustrates the tire building drum in the normal or retracted position.
- FIGS 3-6 illustrate more details of the cover plate of a first embodiment of the present invention.
- the cover plate 30 is located below flexible center sleeve 40.
- the center sleeve 40 is typically comprised of an elastomer or rubber and functions to retract the segments, like a rubber band, to the collapsed position as shown in Figure 2 .
- the cover plate 30 as shown in Figure 3 is generally rectangular in shape with its longitudinal axis A-A aligned with the longitudinal axis 14 of the tire building drum.
- the cover plate further includes a curved outer surface 42 and one or more ribs 44 that are preferably aligned with the longitudinal axis A-A of the cover plate. Preferably, there are two ribs 44 located on opposite ends of the cover plate as shown in the figures.
- the ribs 44 extend down as sidewalls from the cover plate, and are oriented at about a ninety degree angle such as 85-95 degree, preferably 90 degree, with respect to the outer surface 42. It is desired that the ribs 44 do not extend along the entire length of the cover plate in order to avoid interference with the segments 12.
- the cover plate comprises a single rib aligned or parallel with the longitudinal axis A-A of the cover plate.
- the single rib is located on the longitudinal axis.
- the rib may also be located on one end of the cover plate.
- Ribs 44 function to increase the structural rigidity of the cover plate in order to prevent flexing of the cover plates during the stitching operation.
- Figure 2a illustrates a stitcher in contact with the cover plates 30 of the tire building drum.
- a third embodiment of the cover plate 50 is shown in Figures 7-11 .
- the cover plate has one or more sidewalls extending down from the upper surface, wherein the sidewalls form longitudinal ribs 44.
- the cover plate 50 further comprises longitudinal slots 52 which together with the lots 54 of backing plate 56, form a manifold for vacuum. When the vacuum system (not shown) is turned on, the cover plates with slots hold the tire components onto the drum via suction.
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Tyre Moulding (AREA)
- Rigid Containers With Two Or More Constituent Elements (AREA)
- Tires In General (AREA)
Description
- The present invention relates to a tire building drum, to a cover plate for use with a tire building drum and to the use of the tire building drum.
- All terrain vehicle tires, aircraft tires and other tires have relatively longer sidewalls as compared to passenger tires. The longer sidewalls result in a longer chord length (i.e., the bead to bead distance) as compared to passenger tires. A longer chord length results in longer cover plates, which are mounted on the outer surface of a first stage tire building drum. Because the cover plates are longer, flexing or bending about their longitudinal axis may occur during the stitching operation. The stitching operation presses a gear-like device to the tire component layers successively mounted on the tire building drum. The function of the stitching operation is to eliminate trapped air from between the tire component layers of the green tire, and to promote adhesion of the layers. If excessive flexing of the cover plates occur, the stitching operation may not be effective in removing the trapped air between the layers. This may ultimately result in a defective tire.
- Thus a tire building drum which eliminates the problem of trapped air is desired.
-
JP-A- 60-196330 US-A- 3,932,256 ,JP-A- 08-258 180 JP-A- 11-309790 - The invention relates to a tire building drum according to
claim 1. - In a further aspect, the invention provides a cover plate according to
claim 6. - In a third aspect, the invention relates to the use of the building drum or of the cover plate.
- Dependent claims relate to preferred embodiments of the invention.
- The invention will be described by way of example and with reference to the accompanying drawings in which:
-
Figure 1 is a perspective view of a first stage tire building drum; -
Figure 2 is a cutaway view in the direction 2-2 ofFigure 1 ; -
Figure 2a is a cutaway view in the direction 2-2 ofFigure 1 , shown in the radially expanded condition; -
Figure 3 is a perspective view of a coverplate of the present invention; -
Figure 4 is a top view of the coverplate of the present invention shown inFigure 3 ; -
Figure 5 is a side view of the coverplate of the present invention shown inFigure 3 ; -
Figure 6 is an end view of the coverplate shown inFigure 3 ; -
Figure 7 is a perspective view of a second embodiment of a coverplate of the present invention; -
Figure 8 is an exploded, perspective view of the cover plate ofFigure 7 and respective mounting plate; -
Figure 9 is a top view of the coverplate ofFigure 8 ; -
Figure 10 is a cutaway view in the direction 10-10 ofFigure 9 ; -
Figure 11 is a cutaway view in the direction 11-11 ofFigure 10 . - Turning to the drawings and in particular
Figures 1-2 , there is illustrated a first stagetire building drum 10 embodying improvements especially suited for building tires having a long chord length. Thetire building drum 10 comprises a generally cylindrical shape and is rotatable about alongitudinal axis 14. Thetire drum 10 has acenter portion 11 for receiving successive layers of tire building components such as an inner liner, side walls, chafers, breakers, ply, and beads. Thecenter portion 11 is also adapted to expand radially outward, in order to tighten up the tire building components over the wire beads and to turn up the ends over the beads. The center portion comprises a plurality of segments orfingers 12, which are radially actuatable. Thesegments 12 are arranged in a first and second cylindrical array about adrum axis 14 on eachend cover plates 30 are positioned over thesegments 12. - Each
segment 12 has anupper mounting surface 20 for receiving acover plate 30. Eachsegment 12 is radially actuatable via an air actuated piston (not shown) for moving thecover plates 30 radially outward.Cover plates 30 are mounted upon an upper mounting surface of aguide piston 32. Theguide piston 32 functions to secure the coverplates to the drum and to allow the cover plates to move radially outward with thesegments 12.Figure 2A illustrates a cross sectional view of thetire building drum 10 in the radially expanded position wherein all of the segments are in the expanded position.Figure 2 illustrates the tire building drum in the normal or retracted position. -
Figures 3-6 illustrate more details of the cover plate of a first embodiment of the present invention. Thecover plate 30 is located belowflexible center sleeve 40. Thecenter sleeve 40 is typically comprised of an elastomer or rubber and functions to retract the segments, like a rubber band, to the collapsed position as shown inFigure 2 . Thecover plate 30 as shown inFigure 3 is generally rectangular in shape with its longitudinal axis A-A aligned with thelongitudinal axis 14 of the tire building drum. The cover plate further includes a curvedouter surface 42 and one ormore ribs 44 that are preferably aligned with the longitudinal axis A-A of the cover plate. Preferably, there are tworibs 44 located on opposite ends of the cover plate as shown in the figures. In the preferred embodiment, theribs 44 extend down as sidewalls from the cover plate, and are oriented at about a ninety degree angle such as 85-95 degree, preferably 90 degree, with respect to theouter surface 42. It is desired that theribs 44 do not extend along the entire length of the cover plate in order to avoid interference with thesegments 12. - In a second embodiment of the cover plate (not shown), the cover plate comprises a single rib aligned or parallel with the longitudinal axis A-A of the cover plate. Preferably, the single rib is located on the longitudinal axis. However, the rib may also be located on one end of the cover plate.
-
Ribs 44 function to increase the structural rigidity of the cover plate in order to prevent flexing of the cover plates during the stitching operation.Figure 2a illustrates a stitcher in contact with thecover plates 30 of the tire building drum. - A third embodiment of the
cover plate 50 is shown inFigures 7-11 . The cover plate has one or more sidewalls extending down from the upper surface, wherein the sidewalls formlongitudinal ribs 44. Thecover plate 50 further compriseslongitudinal slots 52 which together with thelots 54 ofbacking plate 56, form a manifold for vacuum. When the vacuum system (not shown) is turned on, the cover plates with slots hold the tire components onto the drum via suction.
Claims (9)
- A tire building drum comprising a plurality of segments (12) in a cylindrical array, a cover plate (30, 50) mounted over each segment, wherein said cover plate (30, 50) has an upper surface having a first and second end, with two opposed sidewalls extending down from the ends of said upper surface, wherein said sidewalls are oriented at an angle in a range of from 85 to 95 degrees with respect to the upper surface and aligned with the longitudinal axis (A-A) of the cover plate (30, 50).
- The tire building drum of claim 1 wherein the angle is 90 degrees.
- The tire building drum of claim 1 wherein said cover plate has an upper curved surface.
- The tire building drum of claim 1 wherein said segments are actuatable in the radial direction.
- The tire building drum of claim 1 wherein the sidewalls do not extend along the entire length of the cover plate (30, 50).
- A cover plate for use with a tire building drum, said cover plate (42) comprising an upper surface and two longitudinal ribs (44) connected to said upper surface, wherein said upper surface has a first and second end with the two longitudinal ribs (44) extending down as sidewalls from the ends of said upper surface, and wherein the sidewalls are oriented at an angle in a range of from 85 to 95 degrees with respect to the upper surface and are aligned with the longitudinal axis (A-A) of the cover plate (30, 50).
- The cover plate of claim 6 wherein the angle is 90 degrees.
- The cover plate of claim 6 or 7 wherein the sidewalls do not extend along the entire length of the cover plate (30, 50).
- Use of the tire building drum (10) according to at least one of claims 1-5 or of the cover plate (30, 50) according to at least one of claims 6-8 to manufacture all terrain vehicle tires or aircraft tires.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/881,117 US20060000554A1 (en) | 2004-06-30 | 2004-06-30 | Cover plate for tire building drum |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1612033A1 EP1612033A1 (en) | 2006-01-04 |
EP1612033B1 true EP1612033B1 (en) | 2008-12-03 |
Family
ID=35056920
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP05105548A Expired - Fee Related EP1612033B1 (en) | 2004-06-30 | 2005-06-22 | Segment cover plate for tire building drum |
Country Status (4)
Country | Link |
---|---|
US (1) | US20060000554A1 (en) |
EP (1) | EP1612033B1 (en) |
BR (1) | BRPI0502325A (en) |
DE (1) | DE602005011362D1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN104875408A (en) * | 2014-02-27 | 2015-09-02 | 固特异轮胎和橡胶公司 | Transfer ring or drum apparatus with adjustable circumference |
Families Citing this family (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2920693A1 (en) * | 2007-09-06 | 2009-03-13 | Michelin Soc Tech | REMOVABLE RIGID CORE FOR THE MANUFACTURE OF TIRES COMPRISING RAY-SIDED LIP |
US20090151873A1 (en) | 2007-12-18 | 2009-06-18 | Pinto Ricardo De Mello | Sleeveless tire building drum |
FR2952849B1 (en) * | 2009-11-25 | 2012-02-24 | Michelin Soc Tech | DEVICE FOR ASSEMBLING PNEUMATIC BRAKE COMPRISING REMOVABLE ORGANS |
EP3102399B1 (en) * | 2014-02-07 | 2018-12-19 | Davian Enterprises, LLC | Expandable belt and tread drum with varied curvature segments |
CN109454910A (en) * | 2018-12-20 | 2019-03-12 | 中国化工集团曙光橡胶工业研究设计院有限公司 | A kind of aircraft tyre molding bead ring |
EP3917765B1 (en) | 2019-01-28 | 2024-03-27 | Davian Enterprises, LLC | Expandable belt and tread drum with reverse offset fingers |
WO2022120117A2 (en) | 2020-12-03 | 2022-06-09 | Davian Enterprises, Llc (Dba Wyko Tire Technologies) | Expandable belt and tread drum with magnetic deck fixing |
Family Cites Families (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1896214A (en) * | 1931-08-20 | 1933-02-07 | Akron Standard Mold Co | Adjustable tire core |
US2367772A (en) * | 1942-07-21 | 1945-01-23 | Goodrich Co B F | Building form |
US2636189A (en) * | 1950-04-15 | 1953-04-28 | Storkline Furniture Corp | Teething rail |
US3867231A (en) * | 1972-06-28 | 1975-02-18 | Goodyear Tire & Rubber | Tire building machine |
US3932256A (en) * | 1974-08-19 | 1976-01-13 | The Goodyear Tire & Rubber Company | Tire building drum |
US4192702A (en) * | 1977-07-05 | 1980-03-11 | Eaton Corporation | Fluid expandable tire building drum with shoe means attached thereto to form a tire building surface |
USD256621S (en) * | 1978-05-30 | 1980-08-26 | Dillon Ronald L | Floor slat for hog confinement facilities or similar article |
JPS60196330A (en) | 1984-03-19 | 1985-10-04 | Bridgestone Corp | Molding drum of tire |
US5326187A (en) * | 1992-10-15 | 1994-07-05 | St Marie Rodney L | Cover for a rail of a fence |
JP2691519B2 (en) | 1995-03-17 | 1997-12-17 | 株式会社森鐵工所 | Device for fixing drum segment member to drum body of tire forming drum device and tire forming drum device |
US5913784A (en) * | 1997-09-15 | 1999-06-22 | Hite; John D. | Decking system |
JP3354486B2 (en) | 1998-04-27 | 2002-12-09 | 住友ゴム工業株式会社 | Tread ring molding apparatus and molding method using the same |
-
2004
- 2004-06-30 US US10/881,117 patent/US20060000554A1/en not_active Abandoned
-
2005
- 2005-06-21 BR BR0502325-4A patent/BRPI0502325A/en not_active IP Right Cessation
- 2005-06-22 EP EP05105548A patent/EP1612033B1/en not_active Expired - Fee Related
- 2005-06-22 DE DE602005011362T patent/DE602005011362D1/en active Active
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN104875408A (en) * | 2014-02-27 | 2015-09-02 | 固特异轮胎和橡胶公司 | Transfer ring or drum apparatus with adjustable circumference |
Also Published As
Publication number | Publication date |
---|---|
DE602005011362D1 (en) | 2009-01-15 |
EP1612033A1 (en) | 2006-01-04 |
US20060000554A1 (en) | 2006-01-05 |
BRPI0502325A (en) | 2006-02-07 |
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